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<P>Hi Paul,</P>
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<P>This questions involves generating turbulent inflow conditions. At the moment, I am initializing a flow using the Walsh solution and recycling it which is working well, but we would like to have more control over the conditions such as maintaining a desired intensity. At the moment, I am using a double periodic box for the recycling portion, however the flow structure is dampened out as it is recycled. </P>
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<P>So, Similar to how the velocity is scaled at the recycling plane to maintain a constant flow rate, we wish to also impose predescribed statistical properties by looking at the energy spectrum, and scale the the first few large scale modes to a desired/predetermined spectrum before scaling the velocity and copying it to the inflow plane. </P>
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<P>To do this, we would take a spatial FFT of either the recycling plane, or the recycling box as a whole. So I was curious to see if there was anything built in to work with before looking around. </P>
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<P>- Michael</P>
<P><BR>----- Original Message -----<BR>From: nek5000-users@lists.mcs.anl.gov<BR>To: "Nekton User List" <nek5000-users@lists.mcs.anl.gov><BR>Sent: Tuesday, July 27, 2010 4:39:46 PM GMT -06:00 US/Canada Central<BR>Subject: Re: [Nek5000-users] Built in FFT?<BR><BR>Hi Michael, What is it that you're trying to do ? Paul </P>
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<P>On Tue, 27 Jul 2010, nek5000-users@lists.mcs.anl.gov wrote: </P>
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<P>> > > Hello, > > > > I am wondering if Nek has a built in subroutine for doing an FFT? I haven't seen anything so far but thought I would inquire about it.</P>
<P> > > > > Thanks, > > Michael ><BR>_______________________________________________ </P>
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